Wifi dropping out after 10.10.2 update

Prior to the Yosemite 10.10.2 update my Wifi was working perfectly fine - Now I am lucky to get 2-3 mins of internet on my iMac. I have 3 other Apple devices in my home (iPhones and iPads) with no Wifi issues so there is absolutely no fault with my modem. I have spoken with Apple Support 4 times in the last 24 hours trying to troubleshoot this with no success. They don't seem to be aware this is a problem many people are experiencing. Does anyone have any tips on how I can fix this until Apple come up with an update that will actually work?? I've only had my iMac for 2 months and it is very close to being thrown out the window as it is completely useless to me without internet. Thanks in advance

Wireless Diagnostics
Wi-FI connection drops
Wi-Fi Problems in OS X Yosemite
Wi-Fi Problems in OS X Yosemite (2)
Wi-Fi Problems in OS X Yosemite (3)
Also try turning off Bluetooth.

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